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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb2206602a9bd0b6873181b7f42c573f712cd9f0181dfe02e8a54f4cccdfe1b' 
  AND token = 'YVj/zD0FLTifzIpi2dorIqiPVJUrr29LjliJ5WH+f/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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