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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b17a758148bae9fa4f12b465855f174e4c6d512f66cea3a664ee1c9c372f48a' 
  AND token = 'Khur8B0K7j1rzyjHOkM4NB6gkVV1nIaf8r6c2GOMa54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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