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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64940a0e008ed6c7fede7269d6e168b5fee09a9427f7f10644e2db4fb47dffcf' 
  AND token = 'qnZeER9u1yQ6u84qEtYr1PxbeShbxt5ypc2o2Xk3xEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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