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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16e2d3d6cef6c0eb3d6937184f7b67e0e50482dcb9e6cd7cb26750ba49301bb' 
  AND token = 'iwZY3w0lRZrafYIZotqC/PxQiKFilepJClylTVI8avg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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