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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34eb4ff8df2e13cc7c9f5bed5eb09383937b3750a2f75573d4b8a6b764aaa671' 
  AND token = 'ugnjsow8s5HZ68bVHmjxxXe6u2UIC5X5HZMPaTKVOtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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