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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3264f289ab73eb221c1c99cd3b47437dc3ac27bd8dffa084258952a0d4d40ffe' 
  AND token = 'FEtyrgk8cMlYV+Azq1+BQD18uT9U4KPw9HfuHrSyWgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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