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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b637e6bfc2a759a449d52a4438c36e475c58eff5381c86424791840c2694293b' 
  AND token = 'w7NBG9I9WxqsyU2LDYSAXNlvrNF9BsrBt7Mv+UDD6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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