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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b855768ba5da7a823dc9c0fe2de997b5687cf8120bffe9eefaeaf7f92d4513' 
  AND token = 'tYADgCWkvfdR295a/V6FEIAlUpsCZ6/8MrMhNLZtNGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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