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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f8591169a77495e4fd025ec2d50a48a09b783106f1472f4eca10dcc2e15ce6' 
  AND token = 'eC32q6xHA2PDrBN8+27NJkEXsOb7CwUX1BNPA/qJLJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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