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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab98d77a1c6d5eaad94c7f6376f609bb054d5f9084ee751d2ddd1bdb03a8f20' 
  AND token = 'EKsk49o/zOPh3GueAu3s60xV/iuW8RXP43f8qnSl9Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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