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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a434fbae38b1f842d1db98ad8850e5ec105b7a851b1aed2e7089f5e5faffc28' 
  AND token = 'LSypUFlVLXWWyNlGnP+ZxHvqaSRAhyEs7rwdxQmqb1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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