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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df95876a049283de19f3f612708f6c7fd2bd48c8693af487aee8c0af7d88fbc' 
  AND token = 'DsYe54PeZcCZeUQ1k9UI8lggu21oW3Cjr0bwCtl0og0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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