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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e19ccd8780033c285fd1303d301e3a31785893cee010afd6be6f56871832941' 
  AND token = 'PBtrRS2rdEErx0tdX2CAg0VFF0HM3LmxXoFaYzP4LVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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