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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7e9bf606e96caf2137cac46a4e04071970fa4d6d60efcb0d4b35b991512a6b' 
  AND token = 'aJv/6J8Zpttq9tPBqXS/7DDQcmwyQTZU5v11H/EIyOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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