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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28919cfbda517d79373036dba6d8b0c8695cd363c6f6c3636ab64108890dce0' 
  AND token = 'Gzn/srVI+T8SPnQW/Ny1J8SstY4/WuEOqXawLYZ6ZU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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