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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9d1bd96bde9e9cf5c552b97034b498c9a83f27dcbe59c2bf8ac40c706b8801' 
  AND token = '0RKs309Wd1zlZX74tq2N0MPqfPcArwsj89K9IoGLSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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