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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ae9d03c4ccdb7b5b5aaa72eb9ed197c9e028a169ad2a1d60b6111cdb0f97c4' 
  AND token = 'YSAfSbqgVrUzcKVqWitpa+uUNeAXt6lbFNV2zctug6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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