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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06e1bba053435e245b0a0aa42905a5c1b80304f07e552395a9f4257c5ba8451' 
  AND token = 'H8F1VnOkyz93+G8W+ja76/0WUCRr7bNGzlCpd4CFPjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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