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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c97dcdcccc9a24e1d421563c31ffadb778a484e4c96b69103c48228fc558a3c' 
  AND token = 'm643pYpeKrvu4uj8974lPGNT6e3l/Db3dmuZ6Ij+6u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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