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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7f8a62d17bb95c309bb3999dd18667204c330b7c992694e86de49e682a512f' 
  AND token = 'tQxgGfnUoJ3l0n3eEDi8mSbWP2s6+gsh4aeg/zqS69w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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