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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ff295233d4bcd99553c6b76b54761055de5a186f6e0fc1677bf2e40fc9d762' 
  AND token = '24GziNlnMTGmD0WeFsl1jAcUl46mnxoDFBUAkBWur04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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