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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f1696dc06d3666de15500af20ee5ccf34d891fb16a6fd2602c51f5587e04f5' 
  AND token = 'vAeEBdwKlq+35lYa9gG3/pz2opivL7f5+vQ1xEHbdS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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