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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cda635b2f54df401770400e2f4e4ac91cc47240e4bec638aca1926701385735' 
  AND token = 'E/iJn5l7Ui/H3c1BgYr7jQ82nulNajARDaoD+RqI5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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