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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c10cbbda8b0525ce8af5cd171a7684087d81b3a6a08e403f1895d04de852d4' 
  AND token = 'orrMnSRrPR6hbO+dQLrl0TYAObpuGcyR4DkjpXYCWZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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