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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5796b66d3c58d2ad79161fa7d774cfd2300c56e3a0f7f0d166bafc5e31f2ff61' 
  AND token = 'rk2GVOqZweACSAsUIQVmmI6UIeUV3v6fbBu7BdYjx2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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