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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdd462bfee9e96cb38e3389aeb5c3aa8e44df4e7dbd6f865e308669eabbf8e2' 
  AND token = 'h2nFFe1DF3kBRGqhL18VvF9f5rWRW+WFMSZPrIAoi3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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