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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5116a107d39f250ea9af8c539fd5080b2b03ee16834bc729cdd71e942207ced8' 
  AND token = '9RphwqyjvwWODzeDh4/6O5BN0JsgcPnyUQ5Tm7IMCRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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