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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8459fb0b2a15082f9c665c445c4c5c2a9baafd76de9a71f386e9fece32d89b3b' 
  AND token = 'zXra4MsuZw7MinTOQw8LctbUmYP+m0sKdXR9se70Lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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