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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4cbc4e496148115ce9981734d4edcf421125b4a3d8c47bb1ce00dba0f0223' 
  AND token = 'e9c+oWnIZV5X6oY9+djGgZEZcOehGVV5at63TGcpHHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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