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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38f481c20edd7ccf0d46fffdbe9439c19999cb468b5b0526cb6473ccacf403b' 
  AND token = 'FqP3BHm7n04udBhRn6Yo31o5fg/MlugGy4Iordgs0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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