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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84498c098eaa2d74abe70a067f137f65b19e0cdf4ef42ea91bc38172194b0e7e' 
  AND token = 'FwFbQUZDCwPWeEsachWaBEyhjr/RPGnny/TG5DF1frc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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