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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c01d0ce6b91ab816febd568081a25af2e05705876d9f3a53112c9c68dbc4ee9' 
  AND token = 'eiE5PoSW/CQB7cp4FCgLPuO1ne1sW0smnkhTajMcHWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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