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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2796073b45eb7037b87620e83abde1686edc30f5b026de063d722b19690e9d41' 
  AND token = 'ZoyzrSOyzsm3GlP+V5XnEaoij/4oEKzKObK0DZNTr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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