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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d252a50046c9f99973438116f271855bf2ae5ee9ae4284f358465fef2d031e' 
  AND token = 'EQ4vQHfHfncaW9h5DYCDfu1JzJg7SZ96dQnFENOcwFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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