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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d4aab26397cb5a595eda23c5d59a635741ca6c1c96bf051a35a14d9610e87b' 
  AND token = 'up/NjC/PRwn1txoD0p1xC7emICu3CgUai1wqlD1e4jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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