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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617fc1c97bfe121082d1cb9ec604c6b0039317405f9130f7acc07edb53234f83' 
  AND token = '42v9uFuWlZo15eyUcNDs/TkrWgb92sljsOqWrXKhf8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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