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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f7c14ed5b4281a54bfbd4fc251daa8a988b54aa9aefbb4d1aba780570ec53d' 
  AND token = 'vJorfLHJ7snLIiF/TvzOvDHr8r4glq1kAqawP0YjTxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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