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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d5e77c86fa0a07c4585a59cbdfc185a15353e74c03a2dd3a87acbd4ca68e83' 
  AND token = 'OgH5BOjzVH+8mRRObOznU5P3qXDac3O36yjuvy0acAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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