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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f93ff530a0d2a58d978ca5680a1bdc82ca843534172b50e611ceb4f15128c4' 
  AND token = '9dYSlf8HyWN+qJAe75d7SAaMkfat27jmKgRHE6C+Mmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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