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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d920caba384fb2d8cf1d06c0470b75779ab29b1094179903d76746b279f6a47' 
  AND token = 'JI75mS40uOgAISJXKCvA4232nVIEhWW8dreJdqtMJuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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