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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf42ead2881de73c32637908afdf10f56d66887e9bede8a587657283f334785' 
  AND token = '0rv0W1ewPu4kTOmzWJENT+30ZeCXzXOJpbF7wPgD8bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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