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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8435c3d977cbe748f495850263b21d7e2cd93c80a55252891153d94e2eb59c' 
  AND token = 'SRm8HdvaXb8dA64aWc2qNWQ0jThcA8N+3wQV9KGuVwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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