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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821e3bd9786a621f18e0e7633e882488223a572895d8bcd1b3ea0c657852ad7d' 
  AND token = 'YFM/ZyIGWRc3DyZ5Btp4Tju3l8VYGBXb/n9SAyF/c1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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