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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3911890b84973c0be01668a6a6484268e48ba6888be655a5e547ebd78cb6f82f' 
  AND token = 'CQzAlK60o+cQzQ4tp1ElZMhpgtm7XO8hMRRzSHmUzDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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