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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5f626a52fbaef9994b120ec78a70573f31be187f98b42cb195b666f0ccaf83' 
  AND token = '73nr/5b3k3NwQCXbEAsbKtgWXGOipztOcmnUYQ1pB3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}