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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357aa20e7f990d52ea5e34aae648cfd2d058538335412b323b69e22497babb3a' 
  AND token = 'ovEBFrN282dvDyNQzMf4FaR3c97BH1Zly/CPLxV4rvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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