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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ab4b54a6c033131d370894f39fa3abad7287d3ea9e4bb3d2583d5e9c607af6' 
  AND token = 'fuHgIDCRSAYJd5lcSTE5xRR+WwnFjQv0loexWtoQu2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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