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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f76caad17c9ba6bc9f5f8fe091746112e6234bde404eab976f804897d9d34de' 
  AND token = 'Lfyu5xGsX/mGkbNXW0z1FGFO0beK9voWN4+KmN1XZVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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