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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633a4e226138db348f8260fa4653985840db287beb48abc17dc72c4a6f64d794' 
  AND token = 'S5phA06+oD0HXPGZ497wPtR1QYjRBDfG528ud5IaO34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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