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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e62fa418142e83d4469c589a09b98251e195c719151da3fbc48bd3165b95d9' 
  AND token = 'g0wq105Q1N5hzLsImdoRQ87s8Nfufx+4+5wQn/wTB+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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