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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dde032e2d08ec5b03145f89f3308778c9ba5a40f33c7ff63d8660b5c15f292' 
  AND token = 'YmhbsYDYEG1Rvip2MRQy6b9uCTeny2s5saGFQQxajQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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