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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40091bd3679b3f3ef6e88ebc8fd82012a4a946dccf5fab9fd2b046b967ce3081' 
  AND token = 'lf+pDa+m45z8L4hrHjTRDis08go1QaFr5lGhlpfnlMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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