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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6c61c807971d91923aae8901fa77978c6f75ae76cd282a164aa44cb439db7e' 
  AND token = '/c1OX5EqNXHm5h8U5w8cbi3NG8AioFd8dn8ldXIv5t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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