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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fc853cea68f48e19e02575b19a18af929a324378312a7d7db8ae93a7f38d5d' 
  AND token = 'cIWncjlhpTOMVx0Dl3ART4JpWriF/TShB0lT6sQ+FNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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