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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9599cdc128157dc3795e9a504afb658fe206fa5f8f5baf885591c11c669f10f' 
  AND token = '3HFZCj6T3xJIMFq2bv5AqbTax2wpZoDx03nlA8IjXm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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