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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923e83a90b49961aa106c23fb4382ac9efb6e4b75d1c1470b617c0bdcaaaf715' 
  AND token = 'VMxYBemFjXuehL6n5n+o9bjiLKWAH1V3Nlr41bkQ/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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