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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f64c3f278f15e26bf683c53b0d899a40873276dd4bd0d582cabb5c1c28023e' 
  AND token = '4klod8V5cyL1ZXpuKNwUyPe6jRF448qDrVcPyT82ULo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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