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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d6fc788185731fdbe9281f1c60166b710e8944ba3b51b7cd2baaa085e14fbc' 
  AND token = 'aCLU2Kv2kQ4g6P9EharWXJFTQKqMv/A4fzk2joLaNXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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