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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dbb3d3f7f13b41dcfbfe50dd8f419a39756ccfe82d949b4e80124825f71b29' 
  AND token = 'ixYeLOQVEt7+e2PxdrGhOZ70gjngsrGDTc+iuj5xl8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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