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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617893b4a55c0deb5ee61e815f3f3d97749e11d06d3c252c6a65a06c9b658e8c' 
  AND token = 'kRA45PR/nVZsio4RIxh/rM4xrq+64SMc/gx5m8Fu58s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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