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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b0d0f71dd66381c54ee09c7fef29bea561413a1a14984254d0a5e2794c2cb5' 
  AND token = 'c3fN0QhfPbCFDbr9xfKRZDRC3x2djlzfD5TJ2yA2tLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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