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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1be051d288bbc522fb821d901f53138bfc936e4ad16076dae1b83eee8111966' 
  AND token = '/+w103knSunqqdlV9OQuwkOMP25fbXR0+ZQZOfe649Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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