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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7193bfcb6b5f69ca4aeda6cb33fb661b56f745c5eca201adb6091174e91e23' 
  AND token = 'IUjLY9hvje538gzTb3+KPH3z6UybGkq+885Xnp8ROHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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