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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcfd923d2f62533b81b7f4206a18ac20653927de017ee1f2d2d50ce6d58b56e' 
  AND token = 'rVsDDDqjX3UcGVPnO+n1F0DQon9F11AdmyvOev/Fle0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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