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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038b1896a88748f1bb92f1eea5dff73f84294bf580000478078a2e7739d2670e' 
  AND token = 'gtc6xELmrZ21GC158LZYuJT9FWMYxPCtTNDnLRNZyys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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