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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c73d82d199d03644a7f6d8b237e649c37cd62e851f6d8cc05633dc43c9b4a8' 
  AND token = 'zRpJiwXkrAIGj5WE9Dvv57ZCAcKY15l2ikqkncIGKic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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