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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f11cc93eaf15f7da945d7c16b9e2f9f9700167d296cce26504bf55b5252cb24' 
  AND token = 'EUJJhBD0LgYgbVX1JVXB3U4iBYcW6kMbiaHP0AIv0Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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