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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3c418ebb1d9e44ee581ac79145ad654d8c353485714def4d76e9d4980d8d76' 
  AND token = 'DFZWbrKBfXJ2DL0H4gqxFExvy3nK1zXItedxuFRfZaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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