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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9f2d36259f6bc3d82a7ae0ce737e48d2361a67bfabcaf0ad8d7b55c2c5b79d' 
  AND token = 'EYdPlfhu7X/FBH6bXTRQQJfeVB9dSDBLF0zH9zn+tnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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